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D
A
U
FIDEEX CONTROL
UNIT
LEFT ENGINE
FIXED COWL
MOUNTED FIRE
DETECT
GEARBOX MOUNTED
FIRE DETECT
CORE ENGINE FIRE
DETECTOR SENSOR
LEFT ENGINE
LOOP A
L ENGINE FIRE
LEFT ENGINE
LOOP B
RIGHT ENGINE
LOOP A
R ENGINE FIRE
RIGHT ENGINE
LOOP B
GX_09_005
RIGHT ENGINE
For Training Purposes Only
Sept 04
9-7
P I LOT T R A I N I N G GU I D E
FIRE PROTECTION
APU COMPARTMENT FIRE DETECTION
APU fire detection is also provided by a dual loop system. Each loop (loop A and loop
B) consists of three sensing elements, located on the APU Eductor, on the right APU
Compartment hatch, and along a strut supporting the APU. In order for a fire to be
detected, at least one sensing element from each loop must detect the fire. When both
loops indicate a fire condition, the FIDEEX will forward that information to the DAUs
and the IACs (should one loop develop a short, the FIDEEX isolates that loop and now
relies on the remaining loop for the detection of a fire).
The DAUs and IACs will illuminate the APU fire DISCH handle, flash the master
WARNING lights, generate an APU FIRE warning message on EICAS, and generate
an APU FIRE voice message.
Dual Loop
Sensing
Element
Strut
Sensing
Element
GX_09_006
9-8 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
FIRE PROTECTION
APU FIDEEX CONTROL SCHEMATIC
The APU fire loop elements send their information to the FIDEEX control unit. The
FIDEEX control unit in turn sends information to the DAU. The DAU reports the
status of the detection system to the IAC which signal the EICAS, and audio control
panel of the warning condition.
When a fire is detected, the APU fire warning handle will illuminate, master
WARNING lights will illuminate, a warning message will appear on EICAS, and a
voice message APU FIRE will sound.
“APU FIRE”
IAC
EICAS
APU
FIRE
HANDLE
D
A
U
HATCH SENSING ELEMENTS
EDUCTOR SENSING
ELEMENTS
STRUT SENSING ELEMENTS
APU COMPARTMENT
APU LOOP A
APU FIRE
APU LOOP B
FIDEEX CONTROL
UNIT
AUDIO
CONTROL
PANEL
GX_09_007
For Training Purposes Only
Sept 04
9-9
P I LOT T R A I N I N G GU I D E
FIRE PROTECTION
MAIN WHEEL WELL (MWW) OVERHEAT DETECTION
The main landing gear bays can be subjected to overheat conditions due to brake/tire
overheat, or fire. The MWW overheat detection is provided by a single loop system
for each main wheel well (left and right); each loop consists of one sensing element.
The sensing elements are mounted in the vicinity of the brakes on the top surface of
each MWW bin.
The FIDEEX control unit continuously monitors the heat sensing elements in the main
landing gear area. Any overheat condition or system fault detected by the monitoring
system is annunciated on EICAS in the form of a main landing gear bay overheat
warning message, overheat fail caution message, or main landing gear bay overheat
fault. The gear bay overheat warning message will be accompanied by an aural
warning.
The FIDEEX control unit receives signals from the MWW sensing elements, and in
turn sends information to the DAU. The DAU reports the status of the detection
system to the IAC which signal the EICAS and audio control panel for warning
conditions.
Overheat
Detector
“GEAR BAY OVERHEAT”
LEFT MLG
LOOP
RIGHT MLG
LOOP
AUDIO
CONTROL
PANEL
IAC
EICAS
D
A
U
MAIN LANDING GEAR (MLG)
SENSING ELEMENTS
MAIN LANDING GEAR (MLG)
SENSING ELEMENTS
FIDEEX CONTROL
UNIT
GX_09_008
9-10 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
FIRE PROTECTION
SMOKE DETECTION
The following smoke detectors are installed on the “green” configuration of the
(Global Express) aircraft:
• Forward avionics bay
• Aft avionics bay
• Baggage compartment (but not functionally connected)
The following smoke detectors are installed on the “green” configuration of the
(Global 5000) aircraft:
• Forward avionics bay
• Aft avionics bay
• Avionics rack
• Baggage compartment (but not functionally connected)
The smoke detectors installed in the lavatories, cabin and closets are installed by the
completion center(s). Also, the completion center(s) is/are responsible for functionally
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